US6176796B1 - Continuously variable transmission with clutch having enhanced air cooling - Google Patents
Continuously variable transmission with clutch having enhanced air cooling Download PDFInfo
- Publication number
- US6176796B1 US6176796B1 US09/277,256 US27725699A US6176796B1 US 6176796 B1 US6176796 B1 US 6176796B1 US 27725699 A US27725699 A US 27725699A US 6176796 B1 US6176796 B1 US 6176796B1
- Authority
- US
- United States
- Prior art keywords
- sheave
- fins
- radially
- continuously variable
- variable transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/52—Pulleys or friction discs of adjustable construction
- F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/048—Type of gearings to be lubricated, cooled or heated
- F16H57/0487—Friction gearings
- F16H57/0489—Friction gearings with endless flexible members, e.g. belt CVTs
Definitions
- the invention relates to continuously variable transmissions, such as those used on snowmobiles, and, in particular, to a continuously variable transmission having a clutch with structures for enhancing air cooling of the clutch.
- CVT's continuously variable transmissions
- ATV's all-terrain vehicles
- CVT's do not require shifting through a series of forward gears, but rather provide a continuously variable gear ratio that automatically adjusts as the vehicle speeds up or slows down, thus providing relatively easy operation for the rider.
- CVT's are comprised of a drive clutch, a driven clutch, and an endless V-belt disposed about the clutches.
- the drive clutch includes a pair of opposed sheaves, which together define a generally V-shaped “pulley” within which the V-belt rides.
- the driven clutch is similarly configured from a pair of opposed sheaves.
- the sheaves of the drive clutch are normally biased (such as by a spring) away from each other and the sheaves of the driven clutch are normally biased toward each other.
- the V-belt rides near the center of the drive clutch and near the outer periphery of the driven clutch.
- a centrifugal mechanism in the drive clutch pushes one of the the drive clutch sheaves toward the other, squeezing the V-belt and pushing it radially outwardly. Because the V-belt is essentially inelastic, the belt is pulled radially inwardly on the driven clutch, causing one of the driven clutch sheaves to move axially away from the other driven clutch sheave.
- Friction results not only from the inward and outward movement of the V-belt between the sheaves of the drive and driven clutches, but also from the constant compression of the clutch sheaves against the V-belt. That is, in order to enable the belt to transfer torque from the drive clutch to the driven clutch without slipping, it is important that the sheaves of the clutches squeeze relatively hard against the side walls of the V-belt.
- the invention provides a CVT having air cooling channels built into the outer face of at least one, and preferably more than one, of the sheaves of the clutches.
- the CVT is comprised of a drive clutch having an input shaft, a driven clutch having an output shaft, and an endless belt disposed about the drive and driven clutches.
- Each clutch includes an axially stationary sheave and an axially moveable sheave.
- Each sheave includes a sheave body with an inner, belt-engaging face and an outer face. At least one of the sheaves has a plurality of generally radially oriented fins extending axially from the outer face of the sheave body.
- the sheave further includes an outer plate defining with the fins and the outer face of the sheave body a plurality of generally radially oriented air cooling channels.
- Each channel preferably is open at its radially outward end and at its radially inward end, thereby permitting air to enter the radially inward open ends, pass radially outward through the channels and exit through the radially outward open ends, thereby helping to cool the sheave body.
- FIGS. 1 a , 1 b and 1 c are diagrammatic side views, and FIG. 1 d is a diagrammatic top view, of a CVT of the invention, FIGS. 1 a and 1 d being in a near-idle position, FIG. 1 b being in an intermediate position, and FIG. 1 c being in a high speed position;
- FIG. 2 is a cross-sectional view of a driven clutch of the CVT of the invention
- FIG. 3 is a side view of a driven clutch of the CVT of the invention.
- FIG. 4 is a cross-sectional view of FIG. 3, taken along lines 4 — 4 thereof;
- FIG. 5 is a plan view of a plate attachable to the movable sheave of the driven clutch shown in FIGS. 2 - 4 ;
- FIG. 6 is a side view of the plate of FIG. 5;
- FIG. 7 is a plan view of a plate attachable to the stationary sheave of the driven clutch shown in FIG. 2;
- FIG. 8 is a side view of the plate of FIG. 7 .
- CVT continuously variable transmissions
- FIGS. 1 a - 1 d illustrate in diagrammatic fashion the basic function of a CVT of the invention.
- the CVT includes a drive clutch 10 having an input shaft 12 , a driven clutch 20 having an output shaft 22 , and an endless V-belt 18 disposed about the drive and driven clutches.
- the drive clutch 10 includes a pair of opposed sheaves which together define a generally V-shaped “pulley” within which the V-belt 18 rides.
- One of the sheaves 14 is axially movable (i.e., movable in the direction parallel to the axis of the shaft 12 ), and the other sheave 16 is axially stationary.
- the driven clutch 20 is similarly configured from a pair of opposed sheaves, one being axially movable 24 and the other being axially stationary 26 .
- the sheaves 14 and 16 of the drive clutch 10 are normally biased (such as by a spring) axially away from each other, and the sheaves 24 and 26 of the driven clutch 20 are normally biased axially toward each other (typically by a spring).
- the V-belt 18 rides near the center of the drive clutch 10 and near the outer periphery of the driven clutch 20 .
- FIG. 1 b shows the position of the V-belt 18 at an intermediate speed
- FIG. 1c shows the position of the V-belt 18 at top speed.
- FIGS. 2 - 4 show the details of the driven clutch 20 .
- the axially movable sheave 24 has a sheave body 30 with an inner face 32 an outer face 34 (see FIG. 4 ), and a plurality of generally radially oriented fins 36 extending axially from the outer face 34 of the sheave body 30 .
- the sheave 24 also includes an outer plate 38 secured to the sheave body 30 by a plurality of bolts 39 .
- the outer plate 38 defines with the fins 36 and the outer face 34 of the sheave body 30 a plurality of generally radially oriented air cooling channels.
- the channels are formed so as to have radially outward open ends 40 and radially inward open ends 41 , thereby permitting air to enter the radially inward open ends 41 , pass radially through the channels and exit through the radially outward open ends 40 .
- As the air passes through the channels it assures constant movement of the air adjacent to the outer face 34 and the fins 36 , thus picking up heat from the sheave body 30 and fins 36 to cool the sheave 24 .
- the fins 36 are essentially radially straight, thereby defining generally radially straight channels. If desired, however, the fins could be radially curved, spiral or configured in other shapes, as desired, to form channels of corresponding curved or spiral or other shapes. Also, in the preferred embodiment shown in the drawings the axially outward edges of all of the fins 36 on the movable sheave 24 are generally co-planar with one another, so that the essentially flat plate 38 abuts these axially outward edges substantially along the entire radial extent of the plate 38 . Again, however, if desired, the fins and/or the plate could have alternate configurations such that the fins would not necessarily have to touch the plate along its entire radial extent.
- the fins abut the plate along at least half of the radial length of the fins, thereby defining discrete air cooling channels, and preferably all of the fins abut the plate along the entire radial length of the plate 38 .
- FIG. 2 shows the details of the axially stationary sheave 26 of the driven clutch 20 .
- the axially stationary sheave includes a body 30 ′ with an inner face 32 ′ an outer face (not visible in this view), and a plurality of generally radially oriented fins 36 ′ extending axially from the outer face 34 ′ of the sheave body 30 ′.
- the sheave 26 also includes an outer plate 38 ′ defining with the fins 36 ′ and the outer face 34 ′ of the sheave body 30 ′ a plurality of generally radially oriented air cooling channels.
- the channels are formed so as to have radially outward open ends 40 ′ and radially inward open ends 41 ′, thereby permitting air to enter the radially inward open ends 41 ′, pass radially through the channels and exit through the radially outward open ends 40 ′. As the air passes through the channels, it picks up heat from the sheave body 30 ′ and fins 36 ′, thereby helping to cool the sheave 26 .
- the plate 38 ′ of the axially stationary sheave 26 is not flat like the plate 38 of the axially movable sheave 24 , however, because the axially outward edges of the fins are not coplanar along their entire length.
- FIG. 5 - 8 depict the configurations of the two plates 38 and 38 ′, and illustrate how the plate can be formed into any suitable shape.
- the plate of FIGS. 5 - 6 is generally circular with a central opening 37 .
- the plate 38 ′ of FIGS. 7 - 8 also is generally circular with a central opening 37 ′, but it is also curved axially outwardly toward the center to follow the profile of the fins 36 ′ of the axially stationary sheave 26 .
- the plate can be made in any other suitable shape to correspond to the shape of the fins 36 ′, thereby creating a suitably shaped air cooling channel.
- the preferred CVT shown in the drawings includes the cooling channels on both sheaves of the driven clutch.
- such channels may be utilized on just one of the sheaves.
- such channels may also be utilized on the sheaves of the drive clutch in much the same fashion as on the driven clutch.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmissions By Endless Flexible Members (AREA)
- General Details Of Gearings (AREA)
Abstract
Description
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/277,256 US6176796B1 (en) | 1999-03-26 | 1999-03-26 | Continuously variable transmission with clutch having enhanced air cooling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/277,256 US6176796B1 (en) | 1999-03-26 | 1999-03-26 | Continuously variable transmission with clutch having enhanced air cooling |
Publications (1)
Publication Number | Publication Date |
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US6176796B1 true US6176796B1 (en) | 2001-01-23 |
Family
ID=23060082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/277,256 Expired - Lifetime US6176796B1 (en) | 1999-03-26 | 1999-03-26 | Continuously variable transmission with clutch having enhanced air cooling |
Country Status (1)
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US (1) | US6176796B1 (en) |
Cited By (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6938508B1 (en) * | 2003-02-19 | 2005-09-06 | Polaris Industries Inc. | Ventilated clutch having exhaust hub |
US6938544B2 (en) * | 2000-02-09 | 2005-09-06 | Heidelberger Druckmaschinen Ag | Belt drive |
US7002454B1 (en) | 2002-12-02 | 2006-02-21 | Polaris Industries Inc. | System and method for warning an operator of a vehicle if the vehicle is operating in a condition that may result in drive belt failure |
US7070527B1 (en) * | 2002-12-23 | 2006-07-04 | Polaris Industries Inc. | Ventilated clutch assembly with reduced-slip sheave surfaces |
US20080058144A1 (en) * | 2006-08-31 | 2008-03-06 | Shimano Inc. | Bicycle sprocket assembly |
US7363999B2 (en) | 2004-02-10 | 2008-04-29 | Bush Hog, Llc | Positive air flow drive train unit for utility vehicle |
US20080300746A1 (en) * | 2007-06-04 | 2008-12-04 | Zf Friedrichshafen Ag | System for preventing damage to a vehicle |
US20090098966A1 (en) * | 2007-10-11 | 2009-04-16 | Shimano Inc. | Bicycle rear sprocket assembly |
US20090298627A1 (en) * | 2003-02-19 | 2009-12-03 | Johnson Barry A | Ventilated CVT |
US7708097B1 (en) | 2006-06-02 | 2010-05-04 | Polaris Industries Inc. | Combination mounting feature and cover for electrical components |
US20100155170A1 (en) * | 2008-12-22 | 2010-06-24 | Melvin Timothy F | Vehicle |
US8439019B1 (en) | 2009-02-25 | 2013-05-14 | Accessible Technologies, Inc. | Compressed air delivery system with integrated cooling of a continuous variable transmission |
US8439020B1 (en) | 2009-02-25 | 2013-05-14 | Accessible Technologies, Inc. | CVT driven supercharger with selectively positionable speed multiplying gear set |
US8613337B2 (en) | 2008-06-06 | 2013-12-24 | Polaris Industries Inc. | Air intake system for a vehicle |
EP2826679A2 (en) | 2008-10-10 | 2015-01-21 | Polaris Industries Inc. | Vehicle security system |
US9453573B2 (en) | 2014-06-30 | 2016-09-27 | Brp-Powertrain Gmbh & Co. Kg | Continuously variable transmission assembly for a vehicle |
US9719591B2 (en) | 2015-08-12 | 2017-08-01 | Deere & Company | Continuously variable transmission cooling fan |
US9725023B2 (en) | 2015-05-15 | 2017-08-08 | Polaris Industries Inc. | Utility vehicle |
WO2017139440A1 (en) | 2016-02-10 | 2017-08-17 | Polaris Industries Inc. | Recreational vehicle group management system |
WO2017205322A2 (en) | 2016-05-23 | 2017-11-30 | Indian Motorcycle International, LLC | Display systems and methods for a recreational vehicle |
WO2017218225A1 (en) | 2016-06-14 | 2017-12-21 | Polaris Industries, Inc. | Hybrid utility vehicle |
WO2018094212A2 (en) | 2016-11-18 | 2018-05-24 | Polaris Industries Inc. | Vehicle having adjustable suspension |
US20180180163A1 (en) * | 2016-12-22 | 2018-06-28 | Polaris Industries Inc. | Housing for a transmission |
US10066728B2 (en) | 2015-08-12 | 2018-09-04 | Deere & Company | Continuously variable transmission clutch sheave cover |
WO2018226910A1 (en) | 2017-06-09 | 2018-12-13 | Polaris Industries Inc. | Adjustable vehicle suspension system |
US10443704B2 (en) | 2017-02-28 | 2019-10-15 | Textron Innovations Inc. | Continuously variable transmission cooling |
WO2020072780A1 (en) | 2018-10-05 | 2020-04-09 | Polaris Industries Inc. | Hybrid utility vehicle |
US10648554B2 (en) | 2014-09-02 | 2020-05-12 | Polaris Industries Inc. | Continuously variable transmission |
US10766533B2 (en) | 2015-12-10 | 2020-09-08 | Polaris Industries Inc. | Utility vehicle |
US10946736B2 (en) | 2018-06-05 | 2021-03-16 | Polaris Industries Inc. | All-terrain vehicle |
US10987987B2 (en) | 2018-11-21 | 2021-04-27 | Polaris Industries Inc. | Vehicle having adjustable compression and rebound damping |
US11124036B2 (en) | 2012-11-07 | 2021-09-21 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
US11529913B2 (en) | 2018-12-21 | 2022-12-20 | Polaris Industries Inc. | Managing recreational vehicles and accessories |
US11543005B2 (en) | 2018-03-19 | 2023-01-03 | Polaris Industries Inc. | Electronic CVT with friction clutch |
US11578793B2 (en) | 2018-03-19 | 2023-02-14 | Polaris Industries Inc. | Continuously variable transmission |
WO2024011210A1 (en) | 2022-07-08 | 2024-01-11 | Polaris Industries Inc. | Autonomous-ready vehicle |
US11904648B2 (en) | 2020-07-17 | 2024-02-20 | Polaris Industries Inc. | Adjustable suspensions and vehicle operation for off-road recreational vehicles |
US11919524B2 (en) | 2014-10-31 | 2024-03-05 | Polaris Industries Inc. | System and method for controlling a vehicle |
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US2953032A (en) * | 1958-07-25 | 1960-09-20 | Rockwell Gmbh | V belt sheave for a stepless v belt transmission, especially for motor vehicles |
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Cited By (74)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6938544B2 (en) * | 2000-02-09 | 2005-09-06 | Heidelberger Druckmaschinen Ag | Belt drive |
US7002454B1 (en) | 2002-12-02 | 2006-02-21 | Polaris Industries Inc. | System and method for warning an operator of a vehicle if the vehicle is operating in a condition that may result in drive belt failure |
US7070527B1 (en) * | 2002-12-23 | 2006-07-04 | Polaris Industries Inc. | Ventilated clutch assembly with reduced-slip sheave surfaces |
US20090298627A1 (en) * | 2003-02-19 | 2009-12-03 | Johnson Barry A | Ventilated CVT |
US6938508B1 (en) * | 2003-02-19 | 2005-09-06 | Polaris Industries Inc. | Ventilated clutch having exhaust hub |
US7363999B2 (en) | 2004-02-10 | 2008-04-29 | Bush Hog, Llc | Positive air flow drive train unit for utility vehicle |
US7708097B1 (en) | 2006-06-02 | 2010-05-04 | Polaris Industries Inc. | Combination mounting feature and cover for electrical components |
US20080058144A1 (en) * | 2006-08-31 | 2008-03-06 | Shimano Inc. | Bicycle sprocket assembly |
US8392047B2 (en) | 2007-06-04 | 2013-03-05 | Zf Friedrichshafen Ag | System for preventing damage to a vehicle |
US20080300746A1 (en) * | 2007-06-04 | 2008-12-04 | Zf Friedrichshafen Ag | System for preventing damage to a vehicle |
US20090098966A1 (en) * | 2007-10-11 | 2009-04-16 | Shimano Inc. | Bicycle rear sprocket assembly |
US9010768B2 (en) | 2008-06-06 | 2015-04-21 | Polaris Industries Inc. | Suspension system for a vehicle |
US9592713B2 (en) | 2008-06-06 | 2017-03-14 | Polaris Industries Inc. | Air intake system for a vehicle |
US8613337B2 (en) | 2008-06-06 | 2013-12-24 | Polaris Industries Inc. | Air intake system for a vehicle |
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WO2010074990A2 (en) | 2008-12-22 | 2010-07-01 | Polaris Industries Inc. | Vehicle |
US20100155170A1 (en) * | 2008-12-22 | 2010-06-24 | Melvin Timothy F | Vehicle |
US8157039B2 (en) | 2008-12-22 | 2012-04-17 | Polaris Industries Inc. | Vehicle |
US8439019B1 (en) | 2009-02-25 | 2013-05-14 | Accessible Technologies, Inc. | Compressed air delivery system with integrated cooling of a continuous variable transmission |
US8439020B1 (en) | 2009-02-25 | 2013-05-14 | Accessible Technologies, Inc. | CVT driven supercharger with selectively positionable speed multiplying gear set |
US11970036B2 (en) | 2012-11-07 | 2024-04-30 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
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US11400786B2 (en) | 2012-11-07 | 2022-08-02 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
US11400787B2 (en) | 2012-11-07 | 2022-08-02 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
US11400785B2 (en) | 2012-11-07 | 2022-08-02 | Polaris Industries Inc. | Vehicle having suspension with continuous damping control |
US9453573B2 (en) | 2014-06-30 | 2016-09-27 | Brp-Powertrain Gmbh & Co. Kg | Continuously variable transmission assembly for a vehicle |
US11879542B2 (en) | 2014-09-02 | 2024-01-23 | Polaris Industries Inc. | Continuously variable transmission |
US12072018B2 (en) | 2014-09-02 | 2024-08-27 | Polaris Industries Inc. | Continuously variable transmission |
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US9725023B2 (en) | 2015-05-15 | 2017-08-08 | Polaris Industries Inc. | Utility vehicle |
US10066728B2 (en) | 2015-08-12 | 2018-09-04 | Deere & Company | Continuously variable transmission clutch sheave cover |
US9719591B2 (en) | 2015-08-12 | 2017-08-01 | Deere & Company | Continuously variable transmission cooling fan |
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US11691688B2 (en) | 2016-05-23 | 2023-07-04 | Indian Motorcycle International, LLC | Display systems and methods for a recreational vehicle |
US11400997B2 (en) | 2016-05-23 | 2022-08-02 | Indian Motorcycle International, LLC | Display systems and methods for a recreational vehicle |
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US12018745B2 (en) | 2017-02-28 | 2024-06-25 | Textron Inc. | Continuously variable transmission cooling |
US11448307B2 (en) | 2017-02-28 | 2022-09-20 | Textron Innovations Inc. | Continuously variable transmission cooling |
US10443704B2 (en) | 2017-02-28 | 2019-10-15 | Textron Innovations Inc. | Continuously variable transmission cooling |
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US11543005B2 (en) | 2018-03-19 | 2023-01-03 | Polaris Industries Inc. | Electronic CVT with friction clutch |
US12007014B2 (en) | 2018-03-19 | 2024-06-11 | Polaris Industries Inc. | Continuously variable transmission |
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US12030445B2 (en) | 2018-12-21 | 2024-07-09 | Polaris Industries Inc. | Managing recreational vehicles and accessories |
US11904648B2 (en) | 2020-07-17 | 2024-02-20 | Polaris Industries Inc. | Adjustable suspensions and vehicle operation for off-road recreational vehicles |
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